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I've purchased a wide variety of items from China via both eBay and AliBaba, including end mills and carbide inserts. The quality has ranged from great to trash. Its really a case of read the reviews on the supplier.

If for no other reason than Banggood uses a pleasantly scented oil to coat their lathe tools and not that disgusting, distilled peasant sweat I will continue to buy from them.
But, yes, I've been please with the carbide inserts and holders.

I ordered 4 ER20 R8 collet holders and 2 sets of 12 ER20 collets from Banggood tonight. I'll post how well they work after I try them. Unfortunately I don't have any existing ER20 tooling to compare it with but I'll report back any issues I have with them compared to using native R8 collets.

CCMT Carbide inserts at 4usd per 10 pc box : basically crap but works for roughing nasty stuff and general " i coudn't care less" solution
Lathe insert holders: out of 20 there has been one bad apple that needed work with small file on the insert pocket.
Solid carbide endmills: not sure if there is something wrong with these, price is cheaper than decent hss endmills and they perform more than ok on my small mill.

Anything made of HSS: huge lottery and mostly not worth even the small price. but I have managed to buy some of more exotic threading taps that work.

ER collets and ER chucks: runout from horrible to ok, often some burrs on ID that need work.
Great for lathe toolholding when you use them clamping a round boring bar.

I've had a lot of good carbide engraving cutters and small single flute carbide cutters from China. Probably 1 in 20 of the single flute cutters needed touching up, but the beauty of single flute cutters is that sharpening off hand is easy ;-)

Looking for Korloy brand, high positive, polished, razor sharp inserts for aluminum. The real thing can be relatively expensive, maybe 10 bucks per insert. Last time I looked at eBay with shipping from China prices were all over the place with ads showing the actual "real" looking packaging.

I ordered 4 ER20 R8 collet holders and 2 sets of 12 ER20 collets from Banggood tonight. I'll post how well they work after I try them. Unfortunately I don't have any existing ER20 tooling to compare it with but I'll report back any issues I have with them compared to using native R8 collets.

I'm real interested to hear what you think of them, I have my eye on an R8>ER25 chuck as I already have a set of collets for a collet chuck I made for the lathe. Are these chucks for your preset tool holders?

As for my experiences - lathe tools have been great, CCxT boring bars and turning holders. I do the same as MattiJ and use cheap CCMT inserts for crappy stuff and CCGT inserts for the rest. Some metric spiral flute "hss" taps I bought for peanuts were junk in steel but work ok in alu. The ER25 collet set that I bought cheap was so so - lots of burrs and chips to clean off, with random grinding marks. Got some money off the purchase price as a result and they've been doing fine since. Hard to check run out as I'm not 100% sure of the chuck I made. Haven't had a chance to get round to sorting that out.